The Bit 3 Full-View 80 was the first 80 Column card made for the Atari. It can only be used, exclusively, in an Atari 800, and requires a secondary monochrome display to produce it's output. It was considered to be a very expensive, high-end device, when it was available.
There is very little information on the web about this device. It was often mentioned in both Antic & Analog magazines, but I don't remember any in-depth articles on the hardware, itself. I'm interested in learning more